Finger exerciser



FIG. 1 is a perspective view of the invention;

FIG. 2 is a top view of the invention;

FIG. 3 is a front end view of the invention;

FIG. 4 is a left side view of the invention; and,

FIG. 5 is a right side view of the invention.

The ornamental design for a finger exerciser, as shown and described.